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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed89c6dffee4559f1284a544c054dc967941baecde39d3e75ae4b2ec731d7c74' 
  AND token = '/30/PiOF/Rx2GTpUOvN3Hk7cTWUE/iuUDX3drtYC/3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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