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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ed730ce4d307b5ddacd237e68e20f2e1657b578378877c3f883479a85eb7d0d' 
  AND token = 'jTpOyuTmx6OyUulIW7dV9dg9fW8Lb+dccAgVlr8+SYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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