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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '86c2c1bda9bb1d6c1ac80839cad14e8ec555ed0e7f74b5fd2684949d3995a390' 
  AND token = 'IzRPjSlzCAODMK7mpkHrLbe13X3MnraTqFvoc1VmF9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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