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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '582115d741431966ebc6484c7a7457edf052d758f1addec81b39d9b9f5f4c3c0' 
  AND token = '5g/7wln2KzPw1ILSHaMXNtifQte0eUggfCo6ZbNo7Sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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