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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e6c416110b0b64bf4ca6b2488e52514be01a2bf242053a8b4a645d1bf53ae54' 
  AND token = 'TP/EIb50CoN62AcEYxAGYYRoqYDhsT7Wu40I2NWH6+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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