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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '584cb1472d752abc06eac9cde1a3033fd055724634fbe5854e4139a5112142a0' 
  AND token = '4L86F92cOgyfMs4n7hL9OEHc5Sh52HSaobmblORgl+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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