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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aeceb4b992d2dd8152bcbc62ff656d48add5fee926beab8becb6b22001dd6da7' 
  AND token = '2XmI/24VVrKt/OTH77GdGJ08NotXAvh51IAFZW3A0GY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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