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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4e845670e29ed1ed503bd12bf9929d2ab0bae60dcadb63411e9319197f55ae5' 
  AND token = 'IfsbIzJvUzsyOnCitgmHZPimdIeoPBjLen2BoQu+R00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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