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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2b5ef852dbaad07268b3003c2ab5d9e80c651cb0fac1a07f79facaba8c4deee' 
  AND token = 'IrBfPHyiycUxa6fUDWDAuz4Rn+Q3pmm3Of2DI1/LF1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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