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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f301d78660d590a98d1853e6732dd59abc8e00d1b4301a9c11e86ff3b476ae42' 
  AND token = 'tJ5BvkdyEvaNqLxiEZRei/L6xb2Uo4++KZzKiy451wU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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