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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '00de4eb28802ee9e9b4a12f6c69ee94564f519cef438914b5be32d8c0e025b2e' 
  AND token = 'YgeSHXvYC4+aFQIespUE9rrvmVAVeLUnMXpPQb4V7so=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00259

JSON explain

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