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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b2be2c07baf2ff55d5c71e2296be59eb02434f7f3c2da90a47d0e9b2c977a60' 
  AND token = 'BMRPpGeBUyRX3fIh/OLiPm47uQmjun4+hR/5tL8tLxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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