SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c56234d571378b1db5c915e574f84ba8b29aa9168315f1ef37c38b2927dc556' 
  AND token = 'Q5XA17CwS+ti0wn3GbYYUB1q35XXIu02imuCIRhvhVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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