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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b80abb281412e948b91cde5455bcc5daed990df34ee12761bcfeb769d49b50ba' 
  AND token = 'ewPw/PwgC/S5plZO2sBAMVgF5R/StHlGfBNlOiXeFck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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