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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c6aea84c39338851256246737a3ab98e2d87166560f57e54d28ea8b6459dc1e8' 
  AND token = 'pzgfT+y6Qavm6EjTiUX07K1VTCzXHaez87FTvc+Q6Ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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