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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a9a79dea2f7912082b81e6ef7986b8bbbaecca5ea6b0d9ff45fff70c32a1908' 
  AND token = 'E60W6rB34IHAMzM6jsVng7Zr01mXeeBi5b2rww5h04s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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