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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '74e6bb4ac5b69d5db3e509880c1dbb076d90b5c5e8b48a6d789742ede1c5fa4d' 
  AND token = '3HwqIf8IqoY4v/J98cY8U4rOTa9D9I1506JM+7NdDC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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