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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a7905a06c9d5ae92c4f78d63c95f4cc5b5ffb454b0f1edcdf6a87f2395a27998' 
  AND token = 'xAqRPtZLLA+RQRJHRAm4sF1WPUn1XkuliMx/cI3t9Ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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