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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e51b9412950978196accd20f7ff9e1b61637b5219aadd3855cedfe6e5938e91' 
  AND token = 'ZoqpM7kzK+8coevd5zoCMp8B9iBJONTPMsEAtIAjU10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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