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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c6da4845a4f039ac3a3e41d14760af7a15118a335a8c96cec1502c3ce0839ee7' 
  AND token = 'VkoxKD840jdSUO0Kqwi7hpbxW/Jy+FNCa9PGL7XXYWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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