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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb2456d614d96880b0898de628e7b75d98151dca3a5756fcf5b67979d34bc7d2' 
  AND token = 'GC/EWb9XyKPlNDMwmimQ7uY5c6+/v8mLbFeMmX0pYpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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