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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '037a1374a86dfb0b12428c5b692698924b6eddcb64e95a7abcde5dfd3b777941' 
  AND token = 'Youe0F2Z8iS13i1v6NL4P17fHkGDRHLUlFENLmAPic8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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