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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '629c7d3762c1d3601812cb65b7fa6906548bd26e3daccfd05e2aa15b44eb5e73' 
  AND token = 'O5KRdFscRyie8RXYJaewt0Xc5NO8cG20FacSXmyN/RE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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