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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c39b3c4818bd0b6535e6b9c743b12d6a306b724894c25e68cda51ce702a0253b' 
  AND token = 'GT6juRhsKVrMc6k/FCymfdT9oZ6ZPtel91Q7CSIwUso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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