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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '74a1aee739d99f3da37137cd8efa93b3c6a07b97e387922f75c90a3a58297a52' 
  AND token = 'kkhuSV6juPxRvlvduh4jtzJHAyAWL7IsXcf/CTfojqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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