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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c9e86ff90b0483caac79e2503fe2a3b0d405093ff85398a290d096a5c72a98e' 
  AND token = 'Fyy48l3twErkgXKuvLp1b+y798i4dh+Utgb78WnC3jU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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