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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc9084fb4947bf17da0611f1567bac1e3fb69d074e5ba29dd9932d7c1dc5c652' 
  AND token = 'B9+jO0IrkmH4yQi5QR7YuzrWKW62eYXR7dH+sPBqn1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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