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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3ea6a34083738eec4ded34b277c4a70ba3448d9ff9b6c186447bb84d92fabea' 
  AND token = 'EYrnMmOw5nVpyCzYfYFczii1BSOmq3nVXtVt52DN9IQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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