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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ac5e760089121ebe6298d2e702f11801a40153d86d2ceffaa1dad9894fef92f6' 
  AND token = 'FOQF8n/fUPQVwx/cflGzqpCF0FvJwl9OXVOgP0mEk6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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