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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b0e8de41d2632eb09031b562d552717101e6573c647e16c9b76b082c03db420' 
  AND token = 'r+hjrChYGX0ybzR1g13ro3ormsBdU0O2M823kVgwGzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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