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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3aae8c0e49a1c539cc8e05ddc1a25445c727f4efb8f84786ebd657dfb850d485' 
  AND token = 'EbE2uri8z1hOfovnljS3rynneYM/RA9To3t5RLL7ERM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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