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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '589abf6c2a035a3a4e9334a2eb30bf347986e9a2e36409b3b08da1527ed24c4b' 
  AND token = 'Cf5Lols6iok+FMAalruaSxNFQm+4Iy5grdJW+hRYcNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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