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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c2e4cec1f9f27e42ed36909390b631a7b3e5fee6820c537972593e161da5b38' 
  AND token = '/vyhQ2OpU1k1t0gWpEWC3HkllDa3Z7Z5fmY/IJHa9g4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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