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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e6020e13fdaccbec231a05a1204c11e4422c563d34e26ffc52532a5705402a6f' 
  AND token = 'yBlmuOEozlFOk03lcG2mWHcGsJhdzaWxCV04K4nMUNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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