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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '06a6968fd88a2fcd67f276db1d32effa96d08818f3ca54bbe0526bc5ad3e004c' 
  AND token = 'HPxAPcQtJIL8eT4vTS0YVXyel2Ia+oHYxJNIw5czfqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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