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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb231d79154b73c0520c9d4417a6f67325ce573020e22da85b7880fcd4b7b74c' 
  AND token = 'tv4HlrBipMWkKhbdDQ0Gdc6CsaIL90/6vA0GhbTGLOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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