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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f4ba8c935bce66e5ce80c3b156bfe536f4597ae000fc1aac4c49fab6f671a709' 
  AND token = 'GqIvMAnS8D4GbTw4dKOnegOuzHt0t8qTuwxW2RgLg/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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