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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b12830f2997b78ef4def591b4d795a71d9272c10696a64fc90db1b39732b7fb' 
  AND token = 'Tg0BZsHMmg+UZ1Qxa/6xFray0BwNol/nN4D9SDaS0dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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