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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a5e25cfa2db705e0f58955b022019ed31d760b86a1802607c827f1dd27df649' 
  AND token = 'aGkqDFCTprUA1e84cfR0NrW45DbRxn+2EmEedHC2dvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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