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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe8963b5eec41f9421074a82ffac37ddefbb060745c249ee798e3b110396af80' 
  AND token = 'vTjpObb2XARxi1ir+Y56N4BlTxomPHOk/3xf9sn1xvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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