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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6cd8017d0b92bc9e37dd228b1b333c656450e30da12e86279aaa37e60e897623' 
  AND token = 'kr//d2+U99bEts2t9BIROHsPYFkPvfZ/xFUlNRqWiIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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