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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa6835b09ea62fab559669f8b595a293fe9ffada17b69df62ecbc1638f2c1a52' 
  AND token = '8PKyEJiCVA6sBIuLYHFkSfU9njOzgtJAWjFQCba1hQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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