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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5be5b00c5051f0b3303b5454cb684983aa2ecb51d73841868ef07988a4a0eeb6' 
  AND token = 'ar+aYiVmLCiKXOodmetDRDoi3PnA3sT1tepVJq+NjHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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