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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb4fe0d23b2f9fda39ea3fc35cba4e09ed1951c06c0d442a7b02edb0538deb8c' 
  AND token = 'UVsSBwOhOe13yenlm4435pOofMlWSj4ftEHF8OL2yVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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