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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '251d01df1737a8beebada20bdd8a5eda8ebcc20a7521f961cc0174ab72eeedfb' 
  AND token = 'PLygCKMs+uVPsg522NMmQl7OUDaLCKNiaQW89FA5l+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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