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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40a95454ed95ea48da21d4027116b9c2c94d1425961a7c6ad6d87ce7d1fed707' 
  AND token = 'PltP12i+O4riy7OopsBMSp0nUKUaIifLKFFcPK8it0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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