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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '13c3b16300fcafdfd7ab358fbb05a93b95620b2c51bd3fa30ec66ce69d2192c7' 
  AND token = 'aSldaoCycWHKywKwdnv3N6vDWGnNQICbBJXL8wlOXhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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