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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '35ecee26ecfc64f91be0e0ed1732b9a9400cd2af3a7bcf4a2fd5f3ce75ef1f37' 
  AND token = 'TW9xYpg+DjaXexAhXUuvWsUpGGwu1xuGtwokSSCzPgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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