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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8efe2c79d16f391f4d20e0e958acac269a1915e35e1b0af8c6ca2843ce2f0c62' 
  AND token = 'hY57beznHY4HS76pLzDvON6ina/jNDvZjV1Pk0Sy5K0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}