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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c58c46202fc236ffca10edddf46d899ac3dd1b68ce7dd45f5d468fe7aa76a314' 
  AND token = 'aSn/1yYMJvw/TSc/uGr6o6PGJh52wa5U5zIpKO/fNVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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