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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e92961c3f4aa06d9f79df8f61d19a823a93ee9126126892a060f3aaaf8ed0014' 
  AND token = 'pBZLlDwbMtpsIlW3YZC3AHd3tapS1lC/9uWOGtzXOig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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