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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0ffefb1bab0b21d13f6b8b048a65aaa952a084cf568b47c061177fb183b7b5a9' 
  AND token = 'gp1KqcbbGu9RkG1nBQRs6euITp5ejaExxRHwhNsSNAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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